/Engine/Source/Runtime/Engine/Classes/Engine/Level.h
Call on a level that was loaded from disk instead of PIE-duplicating, to fixup actor references
void FixupForPIE ( int32 PIEInstanceID, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< void(int32, [FSoftObjectPath](API\Runtime\CoreUObject\UObject\FSoftObjectPath) &)> CustomFixupFunction )